Arcbound Wanderer

Modular-Sunburst (This creature enters with a +1/+1 counter on it for each color of mana spent to cast it. When it dies, you may put its +1/+1 counters on target artifact creature.)

Our extensive patrol routine concludes with standing guard before this door for exactly:
-35 hours and 42 minutes and 30 seconds.-
And before you ask, yes, our legs have received implants to aid us in our duties.